OREAS 230b

OREAS 230b was prepared from a blend of gold-bearing ore and barren greenstone. The ore was sourced from the Frogs Leg Gold Mine located 19km west of Kalgoorlie in Western Australia. The Cambrian greenstone was sourced from a quarry 145km north of Melbourne, Australia. The Frogs Leg ore is hosted within Archaean greenstones, with gold occurring in shear-hosted lodes associated with quartz–carbonate veining, pyrite, and arsenopyrite.

Thirty-eight commercial analytical laboratories participated in the program to certify the elements reported below using the following methods:

  • Gold by Pb collection fire assay (25-50 g charge weight)
    with AAS, ICP-OES or ICP-MS finish
  • Gold by PhotonAssay™ with a recommended gross fill mass of 490-520 g
  • Gold by 15-50g aqua regia digestion with ICP-MS and AAS finish
  • Gold by cyanide leach (20-200g) via a variety of cyanide leach methods (LeachWELL tablets, alkaline added sodium cyanide solution and sodium cyanide liquor with LeachWELL powder) with ICP or AAS finish
  • Full ICP-OES and ICP-MS elemental suites by 4-acid (HNO3-HF-HClO4-HCl) digestion
  • Full ICP-OES and ICP-MS elemental suites by aqua regia digestion

To confirm homogeneity, gold by instrumental neutron activation analysis (INAA) was undertaken on 20 x 85mg. This format enabled a nested ANOVA treatment of the INAA results to compare within- and between-unit variances, providing a statistical measure of batch homogeneity.

Analyte Certified Value 1SD Expanded Uncertainty Low Expanded Uncertainty High Method
Au, Gold (ppm) 0.381 0.012 0.376 0.386 Pb Fire Assay
Au, Gold (ppm) 0.374 0.022 0.367 0.380 PhotonAssay
Au, Gold (ppm) 0.368 0.023 0.357 0.379 Aqua Regia Digestion (sample weights 10-50g)
Au, Gold (ppm) 0.363 0.026 0.352 0.375 Cyanide Leach
Ag, Silver (ppm) 0.195 0.017 0.171 0.218 4-Acid Digestion
Al, Aluminium (wt.%) 6.82 0.185 6.64 6.99 4-Acid Digestion
As, Arsenic (ppm) 26.8 1.28 25.7 28.0 4-Acid Digestion
Ba, Barium (ppm) 94 3.9 90 98 4-Acid Digestion
Be, Beryllium (ppm) 0.37 0.024 0.35 0.39 4-Acid Digestion
Bi, Bismuth (ppm) 0.23 0.019 0.21 0.25 4-Acid Digestion
Ca, Calcium (wt.%) 7.22 0.147 7.04 7.40 4-Acid Digestion
Cd, Cadmium (ppm) 0.31 0.025 0.27 0.34 4-Acid Digestion
Ce, Cerium (ppm) 11.1 0.66 10.5 11.6 4-Acid Digestion
Co, Cobalt (ppm) 44.4 1.99 43.0 45.8 4-Acid Digestion
Cr, Chromium (ppm) 86 12 79 94 4-Acid Digestion
Cs, Caesium (ppm) 0.42 0.028 0.39 0.44 4-Acid Digestion
Cu, Copper (ppm) 180 7 174 185 4-Acid Digestion
Dy, Dysprosium (ppm) 4.25 0.415 3.75 4.75 4-Acid Digestion
Er, Erbium (ppm) 2.67 0.161 2.29 3.04 4-Acid Digestion
Eu, Europium (ppm) 1.00 0.072 0.89 1.11 4-Acid Digestion
Fe, Iron (wt.%) 8.96 0.219 8.75 9.18 4-Acid Digestion
Ga, Gallium (ppm) 15.8 0.75 15.1 16.6 4-Acid Digestion
Gd, Gadolinium (ppm) 3.62 0.172 3.22 4.01 4-Acid Digestion
Hf, Hafnium (ppm) 1.78 0.162 1.61 1.96 4-Acid Digestion
Ho, Holmium (ppm) 0.91 0.080 0.79 1.03 4-Acid Digestion
In, Indium (ppm) 0.080 0.004 0.073 0.087 4-Acid Digestion
K, Potassium (wt.%) 0.180 0.009 0.173 0.188 4-Acid Digestion
La, Lanthanum (ppm) 4.35 0.247 4.12 4.58 4-Acid Digestion
Li, Lithium (ppm) 10.1 0.57 9.6 10.6 4-Acid Digestion
Lu, Lutetium (ppm) 0.37 0.027 0.34 0.41 4-Acid Digestion
Mg, Magnesium (wt.%) 3.82 0.132 3.72 3.91 4-Acid Digestion
Mn, Manganese (wt.%) 0.151 0.008 0.145 0.156 4-Acid Digestion
Mo, Molybdenum (ppm) 0.57 0.11 0.42 0.71 4-Acid Digestion
Na, Sodium (wt.%) 2.00 0.051 1.95 2.04 4-Acid Digestion
Nb, Niobium (ppm) 3.75 0.172 3.55 3.95 4-Acid Digestion
Nd, Neodymium (ppm) 8.67 0.569 7.84 9.51 4-Acid Digestion
Ni, Nickel (ppm) 68 4.1 65 71 4-Acid Digestion
P, Phosphorus (wt.%) 0.052 0.001 0.050 0.053 4-Acid Digestion
Pb, Lead (ppm) 9.59 1.29 8.62 10.56 4-Acid Digestion
Pr, Praseodymium (ppm) 1.65 0.055 1.54 1.76 4-Acid Digestion
Rb, Rubidium (ppm) 4.64 0.317 4.36 4.93 4-Acid Digestion
Re, Rhenium (ppm) 0.002 0.001 0.001 0.004 4-Acid Digestion
S, Sulphur (wt.%) 0.272 0.008 0.263 0.280 4-Acid Digestion
Sc, Scandium (ppm) 43.1 1.39 41.7 44.5 4-Acid Digestion
Se, Selenium (ppm) 0.82 0.19 0.62 1.03 4-Acid Digestion
Sm, Samarium (ppm) 2.73 0.146 2.55 2.91 4-Acid Digestion
Sn, Tin (ppm) 0.80 0.068 0.70 0.91 4-Acid Digestion
Sr, Strontium (ppm) 120 5 116 124 4-Acid Digestion
Ta, Tantalum (ppm) 0.24 0.012 0.22 0.26 4-Acid Digestion
Tb, Terbium (ppm) 0.61 0.019 0.57 0.65 4-Acid Digestion
Te, Tellurium (ppm) 0.12 0.02 0.07 0.16 4-Acid Digestion
Th, Thorium (ppm) 0.52 0.047 0.48 0.56 4-Acid Digestion
Ti, Titanium (wt.%) 0.697 0.021 0.677 0.716 4-Acid Digestion
Tl, Thallium (ppm) 0.078 0.007 0.070 0.086 4-Acid Digestion
Tm, Thulium (ppm) 0.38 0.024 0.34 0.42 4-Acid Digestion
U, Uranium (ppm) 0.18 0.03 0.17 0.19 4-Acid Digestion
V, Vanadium (ppm) 314 12 304 325 4-Acid Digestion
W, Tungsten (ppm) 9.14 0.303 8.81 9.47 4-Acid Digestion
Y, Yttrium (ppm) 23.4 1.04 22.4 24.3 4-Acid Digestion
Yb, Ytterbium (ppm) 2.53 0.144 2.29 2.77 4-Acid Digestion
Zn, Zinc (ppm) 109 6 104 114 4-Acid Digestion
Zr, Zirconium (ppm) 56 4.4 51 61 4-Acid Digestion
Ag, Silver (ppm) 0.181 0.016 0.164 0.197 Aqua Regia Digestion
Al, Aluminium (wt.%) 3.40 0.221 3.24 3.56 Aqua Regia Digestion
As, Arsenic (ppm) 25.7 1.40 24.1 27.3 Aqua Regia Digestion
Ba, Barium (ppm) 19.7 0.72 19.0 20.5 Aqua Regia Digestion
Be, Beryllium (ppm) 0.15 0.03 0.12 0.18 Aqua Regia Digestion
Bi, Bismuth (ppm) 0.24 0.014 0.22 0.25 Aqua Regia Digestion
Ca, Calcium (wt.%) 3.11 0.33 2.90 3.32 Aqua Regia Digestion
Cd, Cadmium (ppm) 0.27 0.013 0.24 0.29 Aqua Regia Digestion
Ce, Cerium (ppm) 6.15 0.63 5.67 6.62 Aqua Regia Digestion
Co, Cobalt (ppm) 32.6 1.42 30.9 34.2 Aqua Regia Digestion
Cr, Chromium (ppm) 21.6 1.24 20.3 22.9 Aqua Regia Digestion
Cs, Caesium (ppm) 0.34 0.018 0.32 0.36 Aqua Regia Digestion
Cu, Copper (ppm) 179 6 171 186 Aqua Regia Digestion
Fe, Iron (wt.%) 6.38 0.197 6.14 6.61 Aqua Regia Digestion
Ga, Gallium (ppm) 11.1 1.00 10.2 11.9 Aqua Regia Digestion
Ge, Germanium (ppm) 0.17 0.04 0.13 0.22 Aqua Regia Digestion
Hf, Hafnium (ppm) 0.51 0.045 0.47 0.55 Aqua Regia Digestion
In, Indium (ppm) 0.030 0.003 0.028 0.033 Aqua Regia Digestion
K, Potassium (wt.%) 0.050 0.000 0.049 0.051 Aqua Regia Digestion
La, Lanthanum (ppm) 2.34 0.168 2.17 2.51 Aqua Regia Digestion
Li, Lithium (ppm) 9.22 0.296 8.88 9.56 Aqua Regia Digestion
Mg, Magnesium (wt.%) 1.96 0.047 1.90 2.01 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.088 0.004 0.085 0.092 Aqua Regia Digestion
Mo, Molybdenum (ppm) 0.51 0.028 0.47 0.56 Aqua Regia Digestion
Na, Sodium (wt.%) 0.108 0.013 0.096 0.120 Aqua Regia Digestion
Ni, Nickel (ppm) 44.4 2.40 41.8 47.0 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.048 0.003 0.045 0.050 Aqua Regia Digestion
Pb, Lead (ppm) 8.41 0.478 7.96 8.86 Aqua Regia Digestion
Rb, Rubidium (ppm) 2.24 0.173 2.08 2.40 Aqua Regia Digestion
S, Sulphur (wt.%) 0.266 0.013 0.253 0.280 Aqua Regia Digestion
Sb, Antimony (ppm) 0.52 0.12 0.37 0.67 Aqua Regia Digestion
Sc, Scandium (ppm) 6.01 1.33 5.10 6.91 Aqua Regia Digestion
Se, Selenium (ppm) 0.58 0.10 0.45 0.71 Aqua Regia Digestion
Sn, Tin (ppm) 0.46 0.12 0.37 0.55 Aqua Regia Digestion
Sr, Strontium (ppm) 23.5 3.5 21.1 25.9 Aqua Regia Digestion
Ta, Tantalum (ppm) < 0.010 IND IND IND Aqua Regia Digestion
Te, Tellurium (ppm) 0.10 0.01 0.09 0.12 Aqua Regia Digestion
Th, Thorium (ppm) 0.35 0.05 0.33 0.38 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.359 0.069 0.313 0.405 Aqua Regia Digestion
Tl, Thallium (ppm) 0.045 0.005 0.036 0.055 Aqua Regia Digestion
U, Uranium (ppm) 0.11 0.01 0.09 0.12 Aqua Regia Digestion
V, Vanadium (ppm) 169 16 157 181 Aqua Regia Digestion
W, Tungsten (ppm) 6.59 0.89 5.94 7.24 Aqua Regia Digestion
Y, Yttrium (ppm) 12.1 1.7 11.0 13.3 Aqua Regia Digestion
Zn, Zinc (ppm) 96 3.9 92 99 Aqua Regia Digestion
Zr, Zirconium (ppm) 18.1 3.1 15.7 20.5 Aqua Regia Digestion
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